An answer qualified by some "maybe"s...Giant Coffee uses Strauss Creamery products in its machiattos, cappuccinos, and lattes, which means they *may be* using the homogenized version of the Straus cream-top whole milk, which they *may be* willing to sell to someone by the half gallon.

I think this is probably the closest you'll be able to come to getting something like extra rich milk around here.